/*
 * Even if this code has NOT known copyright, I tooked it from Sun.
 * http://www.java.sun.com
 */
package jdbcmanager.swing;

import javax.swing.*;
import javax.swing.SpringLayout;
import java.awt.*;

/**
 * A 1.4 file that provides utility methods for
 * creating form- or grid-style layouts with SpringLayout.
 * These utilities are used by several programs, such as
 * SpringBox and SpringCompactGrid.
 */

public class SpringUtilities
{
   /**
    * Aligns the first <code>rows</code> * <code>cols</code>
    * components of <code>parent</code> in
    * a grid. Each component is as big as the maximum
    * preferred width and height of the components.
    *
    * @param rows number of rows
    * @param cols number of columns
    * @param initialX x location to start the grid at
    * @param initialY y location to start the grid at
    * @param xPad x padding between cells
    * @param yPad y padding between cells
    */
   public static void makeGrid(Container parent, int rows, int cols, int initialX, int initialY, int xPad, int yPad)
   {
      SpringLayout layout;
      try
      {
         layout = (SpringLayout) parent.getLayout();
      }
      catch (ClassCastException exc)
      {
         System.err.println("The first argument to makeGrid must use SpringLayout.");
         return;
      }

      Spring xPadSpring = Spring.constant(xPad);
      Spring yPadSpring = Spring.constant(yPad);
      Spring initialXSpring = Spring.constant(initialX);
      Spring initialYSpring = Spring.constant(initialY);
      int max = rows * cols;

      //Calculate Springs that are the max of the width/height so that all
      //cells have the same size.
      Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0)).getWidth();
      Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0)).getWidth();
      for (int i = 1; i < max; i++)
      {
         SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));

         maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
         maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
      }

      //Apply the new width/height Spring. This forces all the
      //components to have the same size.
      for (int i = 0; i < max; i++)
      {
         SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));

         cons.setWidth(maxWidthSpring);
         cons.setHeight(maxHeightSpring);
      }

      //Then adjust the x/y constraints of all the cells so that they
      //are aligned in a grid.
      SpringLayout.Constraints lastCons = null;
      SpringLayout.Constraints lastRowCons = null;
      for (int i = 0; i < max; i++)
      {
         SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));
         if (i % cols == 0)
         { //start of new row
            lastRowCons = lastCons;
            cons.setX(initialXSpring);
         }
         else
         { //x position depends on previous component
            cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST), xPadSpring));
         }

         if (i / cols == 0)
         { //first row
            cons.setY(initialYSpring);
         }
         else
         { //y position depends on previous row
            cons.setY(Spring.sum(lastRowCons.getConstraint(SpringLayout.SOUTH), yPadSpring));
         }
         lastCons = cons;
      }

      //Set the parent's size.
      SpringLayout.Constraints pCons = layout.getConstraints(parent);
      pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(Spring.constant(yPad), lastCons.getConstraint(SpringLayout.SOUTH)));
      pCons.setConstraint(SpringLayout.EAST, Spring.sum(Spring.constant(xPad), lastCons.getConstraint(SpringLayout.EAST)));
   }

   /* Used by makeCompactGrid. */
   private static SpringLayout.Constraints getConstraintsForCell(int row, int col, Container parent, int cols)
   {
      SpringLayout layout = (SpringLayout) parent.getLayout();
      Component c = parent.getComponent(row * cols + col);
      return layout.getConstraints(c);
   }

   /**
    * Aligns the first <code>rows</code> * <code>cols</code>
    * components of <code>parent</code> in
    * a grid. Each component in a column is as wide as the maximum
    * preferred width of the components in that column;
    * height is similarly determined for each row.
    * The parent is made just big enough to fit them all.
    *
    * @param rows number of rows
    * @param cols number of columns
    * @param initialX x location to start the grid at
    * @param initialY y location to start the grid at
    * @param xPad x padding between cells
    * @param yPad y padding between cells
    */
   public static void makeCompactGrid(Container parent, int rows, int cols, int initialX, int initialY, int xPad, int yPad)
   {
      SpringLayout layout;
      try
      {
         layout = (SpringLayout) parent.getLayout();
      }
      catch (ClassCastException exc)
      {
         System.err.println("The first argument to makeCompactGrid must use SpringLayout.");
         return;
      }

      //Align all cells in each column and make them the same width.
      Spring x = Spring.constant(initialX);
      for (int c = 0; c < cols; c++)
      {
         Spring width = Spring.constant(0);
         for (int r = 0; r < rows; r++)
         {
            width = Spring.max(width, getConstraintsForCell(r, c, parent, cols).getWidth());
         }
         for (int r = 0; r < rows; r++)
         {
            SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
            constraints.setX(x);
            constraints.setWidth(width);
         }
         x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
      }

      //Align all cells in each row and make them the same height.
      Spring y = Spring.constant(initialY);
      for (int r = 0; r < rows; r++)
      {
         Spring height = Spring.constant(0);
         for (int c = 0; c < cols; c++)
         {
            height = Spring.max(height, getConstraintsForCell(r, c, parent, cols).getHeight());
         }
         for (int c = 0; c < cols; c++)
         {
            SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
            constraints.setY(y);
            constraints.setHeight(height);
         }
         y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
      }

      //Set the parent's size.
      SpringLayout.Constraints pCons = layout.getConstraints(parent);
      pCons.setConstraint(SpringLayout.SOUTH, y);
      pCons.setConstraint(SpringLayout.EAST, x);
   }
}
